Polian went on to explain that not only does that mean Manziel is
a risk but that a player like him requires the team to also
invest heavily in a backup quarterback because he will almost
certainly be needed to start games during the season.

Former Washington Redskins general manager and current NFL
Network analyst Charley Casserly took it a step further, saying
Manziel would scare him "to death" during another interview on
ESPN Radio:

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Casserly went on to note that there are also a "whole litany of
questions" concerning off-the-field behavior. However, he seemed
less concerned about that, noting he would just sit Manziel down
and make sure his first year was football only with no
endorsements or other distractions.

Of course, it only takes one team in the first round to not be
scared. But there are reasons to hesitate.